Lifters are small, cylindrical-shaped components that are located between the camshaft and the valves in an internal combustion engine. They are responsible for transferring the motion of the camshaft to the valves, which open and close to allow air and fuel into the engine and to allow exhaust gases to escape.
If a lifter fails, it can cause the valve to remain open or closed, which can lead to a number of problems. For example, if a valve is stuck open, it can allow too much air and fuel into the engine, which can cause the engine to run rich and misfire. If a valve is stuck closed, it can prevent air and fuel from entering the engine, which can cause the engine to run lean and stall.
In addition, a failed lifter can also damage the camshaft and other engine components. For these reasons, it is important to replace a bad lifter as soon as possible.